This animation shows the global advance and retreat of daily snow cover along with daily sea ice surface temperature over Asia from September 2002 through May 2003. The snow cover was measured by the MODIS instrument on the Terra satellite, while the sea ice surface temperature was measured by the MODIS instrument on the Aqua satellite. Since these instruments cannot take measurements through clouds, in cloud-covered regions or areas with suspect data quality, the prior day's value is retained until a valid data reading is obtained. This visualization designates an area as covered by snow when the instrument takes a valid measurement showing greater than ~50% snow coverage in that area. This area is assumed to be snow covered until the instrument takes a valid measurement showing less than 40% snow coverage in that same area. A color bar indicates the sea ice surface temperature values. The satellite instruments are unable to collect data through darkness. The region in polar darkness is shown as a gray cap over the pole that grows and shrinks seasonally. A date slider indicates the progression of time. SeaWiFS Land Reflectance shows the seasonal changes in land cover. Note: This animation shows the daily advance and retreat of snow cover, and sea ice surface temperature over Asia during the winter of 2002-2003. Data Collected: 2002/07/01 - 2003/05/31, 2000/05/01 - 2000/10/31. Animator: Cindy Starr (GST), Greg Shirah (NASA/GSFC), Marte Newcombe (GST). Scientist: Dorothy Hall (NASA/GSFC). Platforms/Sensors/Data Sets: Aqua/MODIS, Terra/MODIS, Aqua/MODIS/Sea Ice Extent and Ice Surface Temperature Daily L3 Global 4km EASE-Grid Day (MYD29E1D), SeaStar/SeaWiFS/Monthly Land Reflectance, Terra/MODIS/Snow Cover Daily L3 Global 0.05Deg CMG (MOD10C1).